US2015230A

US2015230A - Roller bearing

Info

Publication number: US2015230A
Application number: US748493A
Authority: US
Inventors: Margaret F Lothrop
Original assignee: Individual
Current assignee: Individual
Priority date: 1934-10-16
Filing date: 1934-10-16
Publication date: 1935-09-24
Anticipated expiration: 1952-09-24

Description

INVENTOR WM W [77 A? ATTORNEYS Patented Sept. 24, 1935 ROLLER BEARING Marcus T. Lothrop, Canton, Ohio; Margaret F. Lothrop executrix of said Marcus T. Lothrop,

deceased Application October 16, 1934, Serial No. 148,493

5 Claims.

This invention. relates to anti-friction bearings and more'particularly to bearings of the tapered roller type.

One of the objects of the present invention is to 5 provide a tapered roller bearing of simplified construction which may be economically manufao tured and easily assembled and which will be more efficient in operation.

Another object is to provide an improved ta- 10 pered roller bearing of such construction that the skidding action which occurs in conventional tapered roller bearings as a result of resistance to free rolling action is minimized.

Another object is to provide a tapered roller 15 bearing in which end thrusts are taken by the rollers in such a manner that they will not deviate from their natural alignment.

Another object is to provide a tapered roller bearing which has the combined characteristics 20 of a tapered roller bearing and a ball bearing.

A further object is to provide a tapered roller bearing in which each roller has a thrust flange at its smaller end and in which the thrust flange has a spherical surface disposed to engage the 5 flat end face of the cone element with substantially a point contact.

A still further object is to provide a tapered roller bearing in which the tendency toward misalignment of the rollers is minimized.

3 With the above and other objects in view,

which will be readily understood from the following description, the present invention consists in certain features of construction and combinations of parts which will be readily understood by those skilled in the art to which the invention appertains.

In the accompanying drawing, which illustrates a suitable embodiment of the invention:

Figure l is an end elevation ofthe roller bear- 40 ing unit;

Fig. 2 is a section taken approximately on the line 2-2 of Fig. 1; and

Fig. 3 is a greatly enlarged transverse section taken through the cone and cup elements of the roller bearing unit, more clearly showing the contact that is made between the rollers and cone element.

Referring to the accompanying drawing, in m which like numerals refer to like parts throughout the several views, the bearing of the present invention, as in conventional constructions, includes a pair of annular bearing elements, one of these being an inner race or cone l, and the other 65 being an outer race or cup 2. These, of course,

are concentric and are spaced apart to receive tapered rollers 3.

The cone and cup elements are provided with opposed conical bearing surfaces t and 5 respectively, the lines of taper of which meet at a dimin- 5 ishing point on the axis of the cone, and the taper of the conical surfaces of the cone, cup and rollers being of any suitable degree.

The conical surfaces t and 5 of the cone andcup are uninterrupted from end to end so that they may be readily and economically ground and finished to accurate dimensions, there being no flanges or projections on either the cone or cup to interfere with a simple grinding operation.

Preferably, the inner corners 5 and l of the cone and cup elements, respectively, are slightly rounded so as to avoid sharp corners which might bechipped during handling of these elements.

Each of thetapered rollers 3 includes a main body portion 8 which is suitably tapered from end to end to cooperate with the conical hearing surfaces 4 and 5 of the cone and cup elements, a flange 9 at its smaller end and a slightly circumferentially recessed portion in integrally connecting the body and

flange portions

8 and 9.

The flange 9 is of sufllcient size to be intersected by the line of taper of the cone element l as indicated by z in Fig. 3.

The thrust surface ll of the flange 9, as distinguished from prior constructions, is of spherical contour, as indicated at 1/ in Fig. 3, so as to provide a point contact between the flat radial surface at the smaller end of the cone element I, this point contact being as close to the line of taper of the cone element as is commercially practicable.

A suitable cage for separating and positioning the rollers 3 is employed in the construction shown and comprises a single piece conical shell I! formed from sheet metal and having roller receiving slots i3 therein which open through the metal at the smaller end. The sides of the slots taper toward the small end of the cage so that the rollers may be closely confined therein. Also, the larger end of the cage I2 is provided with a flange ll having its peripheral edge positioned relatively close to the wall of a recess Ila provided in the cup element 2, and with a flange l5 which extends radially inwardly, the internal diameter of the flange l5 being only slightly greater than the internal diameter of the cone element I. In the construction shown in Fig. 1 I have illustrated what may be termed a cup assembly, thatis, one in which the cup element 2, rollers l and cage l2 form one assembly to which the cone element I may be separately assembled. In this case it will be noted that the line of taper of the outer surface of the conical shell forming the cage l2 lies substantially at or within the pitch line of the rollers 3 in order that the cage will hold the rollers in position within the cup element 2 when the cone element is removed.

It is obvious, however, that by increasing the size of the shell of the cage in such a manner that the line of taper of the inner surface of the shell lies outwardly of the pitch line of the rollers, a cone assembly may be provided.

The large view illustrated in Fig. 3 is approximately ten times the actual size of the roller bearing unit illustrated and the unit is shown in this manner to more clearly indicate the spherical contour of the abutment face ll of the roller flange 9. This spherical face ll provides a point contact a with the cone element I, as indicated in Fig. 3.

This point contact occurs as close as commercially practicable to the line of rolling contact between the roller and cone element, and although it appears to be some distance from the line of rolling contact in Fig. 3, it is, as a matter of fact, in a bearing of normal size, relatively close to the line of rolling contact.

In prior roller bearing units having flanged rollers, the natural alignment characteristics of the rollers with the cone and cup elements are disturbed through friction created by the engagement of the substantial portion of the flange face with a rib or face on the cone element. This tends to increase wear and also to cause the rollers to run out of alignment, which likewise increases wear, since a true rolling action is not permitted. In the roller bearing of the present invention, in which the flange face I I of each roller is spherical and has a point contact with the cone element relatively close to the line of rolling contact of each roller with the cone element, the

action simulates that of a ball bearing, that is, a

rolling action, with a result that the frictional forces which tend to produce skidding action are minimized.

End thrust is taken at the smaller ends of the rollers and relatively close to the line of rolling contact, thus leaving the larger endof the roller free of any end thrust engagement with any part of the bearing unit, so that the position of the roller is partly controlled by the engagement of the spherical surface H with the cone element. However, since this control is through a rolling point contact relatively close to the line of rolling contact in which frictional forces are minimized, the natural alignment characteristics of the cone and cup tend to properly maintain each r'oller in its proper position for true rolling.

Although several embodiments of the invention have been herein shown and described, it will be understood that numerous details of the construction shown may be altered or omitted without departing from the spirit of this invention as delined in the following claims.

What I claim is:

- '1. A taper roller bearing comprising concentric cone and cup elements having conical roller engaging surfaces, the outer periphery of said cone element and the inner periphery of said cup element being unobstructed from end to end, and a plurality of tapered rollers disposed between and in contact with said surfaces, each of said rollers having a flange at its smaller end provided with a spherical face facing one of said elements and 5 engaging a substantially radial surface thereof at a point relatively close to the line of the conical surface of the element with which it is engaged.

2. A taper roller bearing comprising concentric cone and cup elements having conical roller en- 10 gaging surfaces, the outer periphery of said cone element and the inner periphery of said cup element being unobstructed from end to end, and a plurality of tapered rollers disposed between and in contact with said surfaces, each of said rollers 15 having a flange at its smaller end provided with a spherical face, said cone element having at its smaller end a substantially radial surface, said spherical face being faced toward and engaged with said radial surface at a point substantially on 20 the line of contact of the roller with the conical surface of said cone element.

3. A taper roller bearing comprising concentric cone and cup elements having conical .roller engaging surfaces, the outer periphery of said cone 25 element and the inner periphery of said cup element being unobstructed from end to end, and a plurality of tapered rollers disposed between said surface, each of said rollers having at its smaller end a flange of greater diameter than the minimum diameter of the roller provided with a spherical face facing an end face of one of said elements, said spherical face having rolling substantially non-frictional pointv engagement with said end face relatively close to the line of the roll 35 seat of the said one element, whereby said cone and cup elements will properly align said rollers.

4. A taper roller bearing comprising concentric inner and outer races having conical roller engaging surfaces, the outer periphery of said inner 40' race and the inner periphery of said outer race being unobstructed from end to end, a plurality of spaced tapered rollers contacting said surfaces, a cage for maintaining said rollers in spaced relation, said inner race having an annular radial 45.

surface at its end of smaller diameter, and each of said rollers having a flange at its smaller end, said flange having a spherical surface facing and in engagement with said annular radial surface at a poirt relatively close to the line of rolling 50 contact of the said roller with said inner race.

5. A taper roller bearing comprising concentric inner and outer races having conical roller engaging surfaces, the outer periphery of said inner race and the inner periphery of said outer race 65'- being unobstructed from end to end, a plurality of spaced tapered rollers contacting said surfaces, a cage for maintaining said rollers in spaced relation, said inner race having an annular radial surface at its end of smaller diameter, and each of said rollers having a flange at its smaller end, said flange having a spherical surface facing and in engagement with said annular radial surface I at a point relatively close to the line of rolling